How much is a ticket from London to Cologne?

The cheapest price found today is $29.

When is it cheaper to fly?

Cheapest month is September — from $29.

Cheapest today — $29. Below is what booking services offer.

Departure	Airline	Stops	Price
Sep 3	Malta Air	direct	$29	View
Sep 29	Malta Air	direct	$29	View
Sep 22	Ryanair	direct	$29	View
Oct 2	Malta Air	direct	$46	View

How much is a ticket from London to Cologne?: The cheapest price found today is $29.
When is it cheaper to fly?: Cheapest month is September — from $29.

Links to booking services are affiliate links. The price stays the same for you.